Should the engine mangement light come on, you can read most issues through the OBD port using a suitable code reader. More information can be found on the relevant pages for your particular smart: fortwo 450, fortwo 451 and Roadster. Should your code reader simply give you a fault code, please use this system to look up the description, possible cause and resolution where available.
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OBD Codes
| Name | Description |
|---|---|
| P0413 |
Secondary Air Injection System Switching Valve A Circuit Open |
| P0414 |
Secondary Air Injection System Switching Valve A Circuit Shorted |
| P0415 |
Secondary Air Injection System Switching Valve B Circuit Malfunction |
| P0416 |
Secondary Air Injection System Switching Valve B Circuit Open |
| P0417 |
Secondary Air Injection System Switching Valve B Circuit Shorted |
| P0418 |
Secondary Air Injection System Relay "A" Circuit Malfunction |
| P0419 |
Secondary Air Injection System Relay "B" Circuit Malfunction |
| P0420 |
Catalyst System Efficiency Below Threshold (Bank 1) |
| P0421 |
Warm Up Catalyst Efficiency Below Threshold (Bank 1) |
| P0422 |
Main Catalyst Efficiency Below Threshold (Bank 1) |
| P0423 |
Heated Catalyst Efficiency Below Threshold (Bank 1) |
| P0424 |
Heated Catalyst Temperature Below Threshold (Bank 1) |
| P0430 |
Catalyst System Efficiency Below Threshold (Bank 2) |
| P0431 |
Warm Up Catalyst Efficiency Below Threshold (Bank 2) |
| P0432 |
Main Catalyst Efficiency Below Threshold (Bank 2) |
| P0433 |
Heated Catalyst Efficiency Below Threshold (Bank 2) |
| P0434 |
Heated Catalyst Temperature Below Threshold (Bank 2) |
| P0440 |
Evaporative Emission Control System Malfunction |
| P0441 |
Evaporative Emission Control System Incorrect Purge Flow |
| P0442 |
Evaporative Emission Control System Leak Detected (small leak) |
| P0443 |
Evaporative Emission Control System Purge Control Valve Circuit Malfunction |
| P0444 |
Evaporative Emission Control System Purge Control Valve Circuit Open |
| P0445 |
Evaporative Emission Control System Purge Control Valve Circuit Shorted |
| P0446 |
Evaporative Emission Control System Vent Control Circuit Malfunction |
| P0447 |
Evaporative Emission Control System Vent Control Circuit Open |
| P0448 |
Evaporative Emission Control System Vent Control Circuit Shorted |
| P0449 |
Evaporative Emission Control System Vent Valve/Solenoid Circuit Malfunction |
| P0450 |
Evaporative Emission Control System Pressure Sensor Malfunction |
| P0451 |
Evaporative Emission Control System Pressure Sensor Range/Performance |
| P0452 |
Evaporative Emission Control System Pressure Sensor Low Input |
